1.

Which of the following groups shows the strongest` -R` effect?A. `-COOR`B. `-CN`C. `-NO_(2)`D. `-CHO`

Answer» Correct Answer - C
`-R` effect of different substituents generally follows the order:
`(CH_(3))_(3)N^(+)gt -NO_(2)gt - CNgt -SO_(3)H gt -CHO gt -COMegt -CO_(2)H`


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